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Texas Instruments LMR33620BQRNXRQ1
- Part No.:
- LMR33620BQRNXRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-PowerVFQFN
- Datasheet:
-
LMR33620BQRNXRQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 12VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR33620BQRNXRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC/DC converter delivering 2 A output current across 3.8 V to 36 V input, with adjustable 1 V–24 V output and fixed 1.4 MHz switching frequency. It integrates 75-mΩ/50-mΩ RDS(on) MOSFETs, peak-current-mode control, and a precision enable input for infotainment power rails.
For engineers reviewing the LMR33620BQRNXRQ1 datasheet, LMR33620BQRNXRQ1 pinout, LMR33620BQRNXRQ1 application, or LMR33620BQRNXRQ1 equivalent, key selection criteria include its 68 ns minimum on-time, 25 µA operating quiescent current, integrated compensation, thermal shutdown, and wettable-flank 3 mm × 2 mm VQFN package optimized for EMI-sensitive automotive layouts.
Technical Context
The LMR33620BQRNXRQ1 implements peak-current-mode control with automatic PFM/PWM mode transition to maintain high efficiency across load range. Its internal 5-V LDO powers control circuitry, while the open-drain PG flag provides regulated output monitoring with 90–110% voltage window thresholds and 60–170 µs glitch filtering.
It features cycle-by-cycle current limiting, hiccup-mode short-circuit protection triggered at FB < 0.4 V, and thermal shutdown at 165°C with 148°C recovery. The 12-pin VQFN package uses symmetrical VIN/PGND layout to cancel magnetic fields and reduce EMI, supported by HotRod™ packaging and parallel input current paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports full automotive battery range including cold-crank (≥3.8 V) and load-dump transients (≤36 V). |
| Output Current | 2 A continuous - delivers sufficient power for USB charging, telematics processors, and display backlight drivers. |
| Switching Frequency | 1.4 MHz - enables compact external components (e.g., ≤2.2 µH inductors) and avoids AM radio band interference. |
| Quiescent Current | 25 µA - sustains low-power sleep modes in always-on automotive modules without draining battery. |
| Min On-Time | 68 ns - enables high step-down ratios (e.g., 12 V → 3.3 V at 1.4 MHz) with stable regulation and minimal dropout. |
| Efficiency Peak | >95% - minimizes thermal stress in sealed enclosures and extends reliability under sustained 2-A loads. |
| Package | 12-pin VQFN (3.0 mm × 2.0 mm, 0.85 mm height) with wettable flanks - supports automated optical inspection (AOI) and improves solder joint reliability. |
Pinout & Package
LMR33620BQRNXRQ1 is housed in a 12-pin, 3.0 mm × 2.0 mm × 0.85 mm VQFN package with wettable flanks and exposed thermal pad (PGND-connected). Pin 1 is marked by top-side dot; pins are numbered counterclockwise from top-left corner in top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 | PGND | Power ground - must be connected to system ground plane and AGND via low-inductance path; ties to thermal pad for heat dissipation. |
| 2, 10 | VIN | Main input supply - requires local 10-µF ceramic capacitor directly between VIN and PGND to suppress high-frequency ripple. |
| 3 | NC | No connect - internally unconnected; PCB trace must route SW to this pad to simplify CBOOT routing per TI layout guidance. |
| 4 | BOOT | Bootstrap supply - connects to 100-nF ceramic capacitor between BOOT and SW; enables high-side MOSFET gate drive above VIN. |
| 5 | VCC | Internal 5-V LDO output - powers internal logic; decoupled with 1-µF capacitor to AGND; not for external loading. |
| 6 | AGND | Analog ground reference - separate from PGND at IC level; connects to system ground at single point near input capacitor. |
| 7 | FB | Feedback input - senses output voltage via resistor divider; accuracy ±1.5% over temp ensures tight regulation for sensitive loads. |
| 8 | PG | Open-drain power-good flag - signals valid output (high) or fault (low); requires external pull-up; used for MCU reset sequencing. |
| 9 | EN | Enable input - precision thresholds (1.231 V turn-on, 1.131 V turn-off) allow accurate input UVLO implementation with external divider. |
| 12 | SW | Switch node - connects to power inductor; high dv/dt node requiring minimized loop area to reduce EMI radiation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive engine bay and infotainment module thermal requirements. |
| Integrated compensation network | Eliminates external Type-II/III compensation components - reduces BOM count and design iteration time for stable loop response. |
| HotRod™ VQFN with wettable flanks | Reduces parasitic inductance by >50% vs standard QFN - suppresses switch-node ringing and cuts radiated EMI by up to 10 dB. |
| Auto PFM/PWM light-load mode | Maintains >85% efficiency at 10-mA load - critical for telematics modules in vehicle sleep states without compromising wake-up latency. |
| Short-circuit hiccup protection | 94-ms off-time followed by soft-start restart - limits average power dissipation during sustained shorts, preventing thermal runaway. |
| 75-mΩ/50-mΩ RDS(on) MOSFETs | Enables 2-A output with <1.2-W conduction loss at full load - reduces need for heatsinking in space-constrained automotive PCBs. |
Applications
| Infotainment USB Charging | Telematics Control Unit (TCU) |
|---|---|
|
Use Scenario: Powering dual-port 5-V USB chargers in center-stack displays with battery backup during engine start. IC Role / Device Role / Timing Role: Primary 12-V-to-5-V buck regulator supplying USB PD controller and port power switches. Use Value: 1.4-MHz operation allows use of 1.5-µH shielded inductor; 25-µA quiescent current prevents battery drain during 72-hr parking mode. |
Use Scenario: Generating 3.3-V rail for LTE modem, GNSS receiver, and CAN FD transceiver in cellular-connected TCU modules. IC Role / Device Role / Timing Role: Main system power supply with PG flag enabling safe boot sequencing and brownout detection. Use Value: 68-ns min on-time supports 12-V-to-3.3-V conversion at 1.4 MHz; AEC-Q100 qualification ensures 15-year field reliability. |
| Instrument Cluster Display Backlight | ADAS Camera Power Module |
|
Use Scenario: Driving white LED strings (3×12 V) from 12-V vehicle bus with dimming control via analog voltage input. IC Role / Device Role / Timing Role: Constant-voltage buck stage feeding external LED driver IC; EN pin synchronized to cluster wake-up signal. Use Value: Precision enable threshold (±10 mV) enables clean 12-V UVLO at 9.5 V; thermal shutdown protects against enclosed housing overheating. |
Use Scenario: Providing isolated 5-V and 3.3-V supplies for image sensor, ISP, and MIPI interface in front-facing ADAS cameras. IC Role / Device Role / Timing Role: First-stage buck converting 12-V battery to intermediate 5-V rail, feeding secondary LDOs or second buck. Use Value: Low EMI design (symmetrical VIN/PGND, HotRod™) meets CISPR-25 Class 5 radiated emissions limits without added shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR33620AQRNXRQ1 | 400-kHz switching frequency; identical pinout, package, and RDS(on); lower frequency increases inductor size but improves light-load efficiency. | Better suited for noise-sensitive analog subsystems where 400-kHz fundamental and harmonics avoid RF bands. | Select when EMI filtering priority outweighs board space constraints; requires larger inductor (≥4.7 µH) and output capacitor. |
| LMR33620CQRNXRQ1 | 2.1-MHz switching frequency; same package and current rating; higher frequency enables smallest passive components but increases switching losses. | Ideal for ultra-compact modules like camera ECU where PCB area is limited and thermal management is robust. | Choose for maximum power density; verify thermal performance at full 2-A load due to higher core losses at 2.1 MHz. |
Compared with LMR33620BQRNXRQ1, the 400-kHz A-version trades switching loss for EMI headroom and inductor size, while the 2.1-MHz C-version maximizes miniaturization at the cost of thermal margin - all three share identical protection features, AEC-Q100 qualification, and functional pin compatibility.
Availability
LMR33620BQRNXRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, telematics control units, and instrument cluster power supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LMR33620BQRNXRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and automotive-grade power management ICs, with decades of automotive qualification expertise and ISO/TS 16949-certified manufacturing.
The LMR336x0-Q1 product line delivers high-efficiency, small-solution-size synchronous buck converters engineered specifically for automotive body electronics, infotainment, and ADAS power rails demanding AEC-Q100 compliance and functional safety readiness.
FAQ
What is the exact switching frequency of LMR33620BQRNXRQ1?
The LMR33620BQRNXRQ1 operates at a nominal switching frequency of 1.4 MHz, with production tolerance of 1.2 MHz to 1.6 MHz across temperature and input voltage. This fixed frequency is factory-programmed and cannot be adjusted externally; it enables compact magnetics and avoids AM-band interference in automotive applications.
Does LMR33620BQRNXRQ1 support adjustable output voltage?
Yes, LMR33620BQRNXRQ1 supports adjustable output voltage from 1 V to 24 V using an external resistor divider on the FB pin. The internal reference voltage is 1.0 V ±1.5%, and the device does not offer fixed-output variants - all RNX-package versions including LMR33620BQRNXRQ1 require external feedback configuration.
What protection features are integrated into LMR33620BQRNXRQ1?
LMR33620BQRNXRQ1 integrates thermal shutdown (165°C trip, 148°C recovery), cycle-by-cycle overcurrent limiting, hiccup-mode short-circuit protection, input undervoltage lockout (UVLO), and output power-good monitoring. These protections operate autonomously without external components and are validated per AEC-Q100 stress test conditions.
Can LMR33620BQRNXRQ1 be used in non-automotive applications?
Yes, LMR33620BQRNXRQ1 can be used in industrial and transportation applications requiring wide input range and high reliability, though its AEC-Q100 qualification, automotive-grade screening, and extended temperature support make it especially valuable where functional safety or long-term supply stability is required - even outside strict automotive use cases.
What is the recommended PCB layout practice for LMR33620BQRNXRQ1?
TI recommends placing input capacitors directly between VIN and PGND pins with shortest possible traces, connecting AGND to PGND at a single point near CIN, routing SW with minimal loop area, and using the exposed thermal pad for thermal relief and grounding. The NC pin (Pin 3) must be routed to SW on the PCB to simplify CBOOT capacitor placement per the official layout guidelines.
LMR33620BQRNXRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.8V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 2A
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-VQFN-HR (3x2)
LMR33620BQRNXRQ1 FAQ
1.How can I place an order for LMR33620BQRNXRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR33620BQRNXRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMR33620BQRNXRQ1 reliable?
The price and inventory of LMR33620BQRNXRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR33620BQRNXRQ1 is usually 5 days.
3.What payment methods are accepted for LMR33620BQRNXRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR33620BQRNXRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR33620BQRNXRQ1?
LMR33620BQRNXRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR33620BQRNXRQ1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMR33620BQRNXRQ1?
For technical support, including LMR33620BQRNXRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR33620BQRNXRQ1 requirements.
6.How does Aetrix verify that LMR33620BQRNXRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR33620BQRNXRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMR33620BQRNXRQ1 meets industry standards.
7.What is the process for return or replacement of LMR33620BQRNXRQ1?
All LMR33620BQRNXRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR33620BQRNXRQ1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMR33620BQRNXRQ1 part is unused and in its original packaging.
Return procedure for LMR33620BQRNXRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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